Organic light emitting diode display and a system of a mask unit and a substrate for making the same

ABSTRACT

An organic light emitting diode display includes a first electrode, a pixel defining layer positioned on the first electrode and including a first opening having a first polygonal shape opening the first electrode, and a first organic emission layer positioned on the pixel defining layer through the first electrode corresponding to the first opening and including a first chamfer adjacent to a corner of the first opening.

CROSS-REFERENCE TO RELATED APPLICATION

This application is filed under 35 U.S.C. § 120 as a continuation ofU.S. patent application Ser. No. 14/169,829, filed on 31 Jan. 2014,which claims priority under 35 U.S.C. § 119 to and the benefit of KoreanPatent Application No. 10-2013-0046362 filed in the Korean IntellectualProperty Office on 25 Apr. 2013, the entire contents of whichapplications are incorporated herein by reference.

BACKGROUND OF THE INVENTION

Field of the Invention

Embodiments of the present invention relate generally to an organiclight emitting diode display and a mask unit, and more particularly, toan organic light emitting diode display including a plurality of organicemission layers emitting different colored light and a mask unit usedwhen the organic emission layer is deposited.

Description of the Related Art

A display device is a device displaying an image, and recently, anorganic light emitting diode display has received attention.

Since the organic light emitting diode display has a self-emissioncharacteristic and does not require a separate light source unlike aliquid crystal display device, it is possible to reduce a thickness anda weight thereof. Further, the organic light emitting diode display hashigh-quality characteristics such as low power consumption, highluminance, and a high response speed.

In general, the organic light emitting diode display includes an anode,a pixel defining layer including an opening defining an area and a shapeof a pixel by opening the anode, an organic emission layer positioned onthe anode corresponding to the opening, and a cathode positioned on theorganic emission layer.

Here, the pixel means a minimum unit displaying an image, and is aportion where the organic emission layer substantially emits light.

An organic emission layer configuring a pixel of an organic lightemitting diode display in the related art is deposited by using a masksuch as a fine metal mask (FMM).

Recently, an organic light emitting diode display implementing highresolution in a limited display area has been developed.

However, in the high resolution organic light emitting diode display,since a size of a pixel is very small and thus a size of a patternformed at the mask is very small according to the opening of the pixeldefining layer, it is difficult to form a pattern at the mask, and as aresult, manufacturing yield of the mask deteriorates.

Further, in the high resolution organic light emitting diode display, adistance between adjacent pixels becomes decreased, and as a result,when the organic emission layer is deposited on an opening through apattern of the mask, an edge of the deposited organic emission layerintrudes into the other opening and two or more organic emission layersare deposited in the other opening, and thus there is a problem in thatcolors of light emitted by a pixel corresponding to the other openingare mixed.

The above information disclosed in this Background section is only forenhancement of understanding of the background of the describedtechnology and therefore it may contain information that does not formthe prior art that is already known in this country to a person ofordinary skill in the art.

SUMMARY OF THE INVENTION

The described technology has been made in an effort to provide anorganic light emitting diode display having advantages of preventingcolors of light emitted by one pixel from being mixed, even though theorganic light emitting diode display is implemented at high resolutionin a limited display area.

Further, the present invention has been made in an effort to provide amask unit having advantages of improving manufacturing yield, eventhough the mask unit is used when a high resolution organic lightemitting diode display is manufactured in a limited display area.

An embodiment provides an organic light emitting diode display includinga first electrode, a pixel defining layer positioned on the firstelectrode and including a first opening having a first polygonal shapeopening the first electrode, and a first organic emission layerpositioned on the pixel defining layer through the first electrodecorresponding to the first opening and including a first chamferadjacent to a corner of the first opening.

A first distance between one edge of the first opening disposed on afirst virtual straight line traversing the first opening and one edge ofthe first organic emission layer may be different from a second distancebetween the other edge of the first opening disposed on a second virtualstraight line which is parallel to the first straight line to traversethe first opening and the other edge of the first organic emissionlayer.

The entire edge of the first organic emission layer may include fourfirst chamfers which are spaced apart from each other and four firstconnection portions connecting ends of the first chamfers.

Each of the four first connection portions may be curved one time ormore and extended.

A central point of the first opening may be positioned at a first vertexof a virtual triangle, the organic light emitting diode display mayfurther include a second electrode which is spaced apart from the firstelectrode and of which a central area is positioned at a second vertexof the virtual triangle, the pixel defining layer further may include asecond opening which has a second polygonal shape opening the secondelectrode and of which a central point is positioned at the secondvertex, and the organic light emitting diode display may further includea second organic emission layer positioned on the pixel defining layerthrough the second electrode corresponding to the second opening andincluding a second chamfer adjacent to a corner of the second opening.

The entire edge of the second organic emission layer may include foursecond chamfers which are spaced apart from each other and four secondconnection portions connecting ends of the second chamfers.

Each of the four second connection portions may be curved one time ormore and extended.

The first chamfer of the first organic emission layer may be overlappedwith the second chamfer of the second organic emission layer.

One of the first organic emission layer and the second organic emissionlayer may emit red light, and the other may emit blue light.

The organic light emitting diode display may further include a thirdelectrode which is spaced apart from the first electrode and the secondelectrode and of which a central area is positioned at a third vertex ofthe virtual triangle, the pixel defining layer further may include athird opening which has a third polygonal shape opening the thirdelectrode and of which a central point is positioned at the thirdvertex, and the organic light emitting diode display may further includea third organic emission layer positioned on the pixel defining layerthrough the third electrode corresponding to the third opening.

The entire edge of the third organic emission layer may have anoctagonal shape.

A part of the entire edge of the third organic emission layer which isspaced apart from the first chamfer and the second chamfer, respectivelymay be overlapped with each edge of the first organic emission layer andthe second organic emission layer.

One of the first organic emission layer, the second organic emissionlayer, and the third organic emission layer may emit red light, anothermay emit blue light, and the other may emit green light.

The virtual triangle may be an isosceles triangle in which a length of afirst side connecting the first vertex and the third vertex is the sameas a length of a second side connecting the second vertex and the thirdvertex.

The first polygon may be a quadrangle, the second polygon may be ahexagon, and the third polygon may be an octagon.

Another embodiment provides a mask unit disposed on a substrateincluding a first electrode and a pixel defining layer positioned on thefirst electrode and including a first opening having a first polygonalshape opening the first electrode. The mask unit includes a first maskthrough-formed to correspond to the pixel defining layer through thefirst electrode corresponding to the first opening and includes a firstmask pattern portion including a first mask chamfer corresponding to acorner of the first opening.

The entire edge of the first mask pattern portion may include four firstmask chamfers which are spaced apart from each other and four first maskconnection portions connecting ends of the first mask chamfers.

Each of the four first mask connection portions may be curved one timeor more and extended.

A central point of the first opening may be positioned at a first vertexof a virtual triangle, and the substrate may further include a secondelectrode which is spaced apart from the first electrode and of which acentral area is positioned at a second vertex of the virtual triangle,and the pixel defining layer may further include a second opening whichhas a second polygonal shape opening the second electrode and of which acentral point is positioned at the second vertex, and the mask unit mayfurther include a second mask through-formed to correspond to the pixeldefining layer through the second electrode corresponding to the secondopening and including a second mask pattern portion including a secondmask chamfer adjacent to a corner of the second opening.

The entire edge of the second mask pattern portion may include foursecond mask chamfers which are spaced apart from each other and foursecond mask connection portions connecting ends of the second maskchamfers.

Each of the four second mask connection portions may be curved one timeor more and extended.

The first chamfer of the first organic emission layer formed on thepixel defining layer through the first mask pattern portion may beoverlapped with the second mask chamfer of the second mask.

The substrate may further include a third electrode which is spacedapart from the first electrode and the second electrode and of which acentral area is positioned at a third vertex of the virtual triangle,and the pixel defining layer may further include a third opening whichhas a third polygonal shape opening the third electrode and of which acentral point is positioned at the third vertex, and the mask unit mayfurther include a third mask including a third mask pattern portionthrough-formed to correspond to the pixel defining layer through thethird electrode corresponding to the third opening.

The entire edge of the third mask pattern portion may have an octagonalshape.

A part of the entire edge of the third mask pattern portion which isspaced apart from the first chamfer of the first organic emission layerformed on the pixel defining layer through the first mask patternportion and the second chamfer of the second organic emission layerformed on the pixel defining layer through the second mask patternportion may be overlapped with each edge of the first organic emissionlayer and the second organic emission layer.

Yet another embodiment provides an organic light emitting diode displayincluding a first electrode, a pixel defining layer positioned on thefirst electrode and including a first opening having a first polygonalshape opening the first electrode, and a first organic emission layerpositioned on the pixel defining layer through the first electrodecorresponding to the first opening and including a first convex portionadjacent to a corner of the first opening.

A first distance between one edge of the first opening disposed on afirst virtual straight line traversing the first opening and one edge ofthe first organic emission layer may be different from a second distancebetween the other edge of the first opening disposed on a second virtualstraight line which is parallel to the first straight line to traversethe first opening and the other edge of the first organic emissionlayer.

The entire edge of the first organic emission layer may include fourfirst convex portions which are connected to each other.

A central point of the first opening may be positioned at a first vertexof a virtual triangle, the organic light emitting diode display mayfurther include a second electrode which is spaced apart from the firstelectrode and of which a central area is positioned at a second vertexof the virtual triangle, and the pixel defining layer may furtherinclude a second opening which has a second polygonal shape opening thesecond electrode and of which a central point is positioned at thesecond vertex, and the organic light emitting diode display may furtherinclude a second organic emission layer positioned on the pixel defininglayer through the second electrode corresponding to the second openingand including a second convex portion adjacent to a corner of the secondopening.

The entire edge of the second organic emission layer may include foursecond convex portions which are connected to each other.

The first convex portion of the first organic emission layer may beoverlapped with the second convex portion of the second organic emissionlayer.

One of the first organic emission layer and the second organic emissionlayer may emit red light, and the other may emit blue light.

The organic light emitting diode display may further include a thirdelectrode which is spaced apart from the first electrode and the secondelectrode and of which a central area is positioned at a third vertex ofthe virtual triangle, the pixel defining layer may further include athird opening which has a third polygonal shape opening the thirdelectrode and of which a central point is positioned at the thirdvertex, and the organic light emitting diode display may further includea third organic emission layer positioned on the pixel defining layerthrough the third electrode corresponding to the third opening.

The entire edge of the third organic emission layer may have a closedloop shape surrounding the edge of the third opening.

One of the first organic emission layer, the second organic emissionlayer, and the third organic emission layer may emit red light, anothermay emit blue light, and the other may emit green light.

The virtual triangle may be an isosceles triangle in which a length of afirst side connecting the first vertex and the third vertex is the sameas a length of a second side connecting the second vertex and the thirdvertex.

The first polygon may be a quadrangle, the second polygon may be ahexagon, and the third polygon may be an octagon.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete appreciation of the invention, and many of the attendantadvantages thereof, will be readily apparent as the same becomes betterunderstood by reference to the following detailed description whenconsidered in conjunction with the accompanying drawings, in which likereference symbols indicate the same or similar components, wherein:

FIG. 1 is a diagram illustrating a partial plane of an organic lightemitting diode display constructed as a first embodiment according tothe principles of the present invention;

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1;

FIG. 3 is a diagram illustrating a partial plane of a first mask of amask unit constructed as a second embodiment according to the principlesof the present invention;

FIG. 4 is a diagram for describing formation of a first organic emissionlayer using the first mask illustrated in FIG. 3;

FIG. 5 is a diagram illustrating a partial plane of a second mask of themask unit according to the second embodiment;

FIG. 6 is a diagram for describing formation of a second organicemission layer using the second mask illustrated in FIG. 5;

FIG. 7 is a diagram illustrating a partial plane of a third mask of themask unit according to the second embodiment;

FIG. 8 is a diagram for describing formation of a third organic emissionlayer using the third mask illustrated in FIG. 7; and

FIG. 9 is a diagram illustrating a partial plane of an organic lightemitting diode display constructed as a third embodiment according tothe principles of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The present invention will be described more fully hereinafter withreference to the accompanying drawings, in which exemplary embodimentsof the invention are shown. As those skilled in the art would realize,the described embodiments may be modified in various different ways, allwithout departing from the spirit or scope of the present invention.

The drawings and description are to be regarded as illustrative innature and not restrictive, and like reference numerals designate likeelements throughout the specification.

Further, in the drawings, size and thickness of each element arearbitrarily illustrated for convenience of description, and the presentinvention is not necessarily limited to those illustrated in thedrawings.

Further, in the specification, unless explicitly described to thecontrary, the word “comprise” and variations such as “comprises” or“comprising”, will be understood to imply the inclusion of statedelements but not the exclusion of any other elements.

Hereinafter, an organic light emitting diode display according to afirst embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 is a diagram illustrating a partial plane of an organic lightemitting diode display according to a first embodiment. For convenienceof description, FIG. 1 mainly illustrates a first electrode, a pixeldefining layer, and an organic emission layer. FIG. 2 is across-sectional view taken along line II-II of FIG. 1.

As illustrated in FIGS. 1 and 2, an organic light emitting diode displayaccording to the first embodiment includes a substrate SU, a circuitpart PC, a first electrode E1, a second electrode E2, a third electrodeE3, a pixel defining layer PDL, a first organic emission layer OL1, asecond organic emission layer OL2, a third organic emission layer OL3,and a common electrode CE.

The substrate SU is formed by an insulating substrate made of glass,quartz, ceramics, metal, plastic, and the like. Further, in the casewhere the substrate SU is made of plastic, the organic light emittingdiode display may have a flexible characteristic, and a stretchable orrollable characteristic.

The circuit part PC is positioned on the substrate SU, and may includewires including one or more scan lines, data lines, driving power lines,common power lines, and the like, and a pixel circuit such as two ormore thin film transistors (TFT) connected to the wires to correspond toone pixel and one or more capacitors, and the like. The circuit part PCmay be formed to have various known structures.

The first electrode E1 is positioned on the circuit part PC, andconnected with the thin film transistor (TFT) of the circuit part PC. Acentral area of the first electrode E1 is positioned at a first vertexP1 of a virtual triangle VT. Here, the virtual triangle VT is anisosceles triangle in which central areas of the first electrode E1, thesecond electrode E2, and the third electrode E3 which are adjacent toeach other are connected to each other. In detail, a length of a firstside V1 connecting the first vertex P1 and the third vertex P3 of thevirtual triangle VT is the same as a length of a second side V2connecting the second vertex P2 and the third vertex P3.

The first electrode E1 may have various polygonal shapes, and thecentral area of the first electrode E1 is opened by a first opening OM1of the pixel defining layer PDL.

The second electrode E2 is positioned on the circuit part PC, and spacedapart from the first electrode E1. The second electrode E2 is connectedwith the thin film transistor (TFT) of the circuit part PC. A centralarea of the second electrode E2 is positioned at the second vertex P2 ofthe virtual triangle VT. The second electrode E2 may have variouspolygonal shapes, and the central area of the second electrode E2 isopened by a second opening OM2 of the pixel defining layer PDL.

The third electrode E3 is spaced apart from the first electrode E1 andthe second electrode E2 and positioned on the circuit part PC. The thirdelectrode E3 is connected with the thin film transistor (TFT) of thecircuit part PC. A central area of the third electrode E3 is positionedat the third vertex P3 of the virtual triangle VT. The third electrodeE3 may have various polygonal shapes, and the central area of the thirdelectrode E3 is opened by a third opening OM3 of the pixel defininglayer PDL.

The first electrode E1 and the second electrode E2 are disposed on avirtual square with the third electrode E3 as the center, and the firstelectrode E1 and the second electrode E2 surround the third electrode E3with the third electrode E3 as the center. Each of the first electrodeE1, the second electrode E2, and the third electrode E3 may be an anodefunctioning as a hole injection electrode or a cathode. The firstelectrode E1, the second electrode E2, and the third electrode E3 may beformed by light transmitting electrodes or light reflecting electrodes.

The pixel defining layer PDL is positioned on the first electrode E1,the second electrode E2, and the third electrode E3, respectively, andcovers edges of the first electrode E1, the second electrode E2, and thethird electrode E3. The pixel defining layer PDL includes the firstopening OM1, the second opening OM2, and the third opening OM3.

The first opening OM1 opens the first electrode E1 and has a firstpolygonal shape which is a quadrangle. The first opening OM1 is spacedapart from the third opening OM3 and the second opening OM2, and acentral point thereof is positioned at the first vertex P1 of thevirtual triangle VT. The first opening OM1 has a larger area than theadjacent third opening OM3 and has a smaller area than the adjacentsecond opening OM2. The first opening OM1 has a quadrangular shape amongthe polygonal shapes, but is not limited thereto and may have polygonalshapes such as a triangle, a pentagon, a hexagon, a heptagon, and anoctagon. A plurality of first openings OM1 is included, and theplurality of first openings OM1 has the same quadrangular shape. Theplurality of first openings OM1 is spaced apart from each other with thethird opening OM3 therebetween. The first organic emission layer OL1emitting red light is positioned on the first electrode E1 opened by thefirst opening OM1. Alternatively, an organic emission layer emittingvarious colored light such as blue, green, or white may be positioned onthe first electrode E1 opened by the first opening OM1.

The second opening OM2 opens the second electrode E2 and has a secondpolygonal shape which is a hexagon. The second opening OM2 is spacedapart from the first opening OM1 and the third opening OM3,respectively, and a central point thereof is positioned at the secondvertex P2 of the virtual triangle VT. The second opening OM2 has alarger area than the adjacent third opening OM3 and first opening OM1,respectively. The second opening OM2 has a hexagonal shape among thepolygonal shapes, but is not limited thereto and may have polygonalshapes such as a triangle, a quadrangle, a pentagon, a heptagon, and anoctagon. A plurality of second openings OM2, and the plurality of secondopenings OM2 has the same hexagonal shape. The plurality of secondopenings OM2 is spaced apart from each other with the third opening OM3therebetween. The second organic emission layer OL2 emitting blue lightis positioned on the second electrode E2 opened by the second openingOM2. Alternatively, an organic emission layer emitting various coloredlight such as red, green, or white may be positioned on the secondelectrode E2 opened by the second opening OM2.

The third opening OM3 opens the third electrode E3 and has a thirdpolygonal shape which is an octagon. The third opening OM3 is spacedapart from the first opening OM1 and the second opening OM2,respectively, and a central point thereof is positioned at the thirdvertex P3 of the virtual triangle VT. The third opening OM3 has asmaller area than the adjacent second opening OM2 and first opening OM1,respectively. The third opening OM3 has an octagonal shape among thepolygonal shapes, but is not limited there to and may have polygonalshapes such as a triangle, a quadrangle, a pentagon, a hexagon, and aheptagon. A plurality of third openings OM3 is included, and adjacentthird openings OM3 among the plurality of third openings OM3 haveoctagonal shapes which are symmetrical to each other. Meanwhile, theplurality of third openings OM3 may have the same octagonal shape. Thethird organic emission layer OL3 emitting green light is positioned onthe third electrode E3 opened by the third opening OM3. Alternatively,an organic emission layer emitting various colored light such as blue,red, or white may be positioned on the third electrode E3 opened by thethird opening OM3.

Meanwhile, the center of the third opening OM3 is positioned at thecentral point of the virtual square, and centers of the first openingOM1 and the second opening OM2 surrounding the third opening OM3 alongthe virtual square may be positioned at adjacent vertexes of the virtualsquare, respectively.

The first organic emission layer OL1 is positioned on the pixel defininglayer PDL through the first electrode E1 corresponding to the firstopening OM1. The first organic emission layer OL1 includes a firstchamfer CM1 adjacent to a corner of the first opening OM1 which is aquadrangle. The first chamfer CM1 may be an edge of the first organicemission layer OL1 that intersects a straight line crossing the centralpoint of the first opening OM1 and a vertex, for example, the corner, ofthe first opening OM1, wherein the vertex or the corner of the firstopening OM1 is disposed between the first chamfer CM1 and the centralpoint of the first opening OM1.

The entire edge of the first organic emission layer OL1 has ahexadecagonal shape, and includes four first chamfers CM1 and four firstconnection portions CO1 connecting ends of the first chamfers CM1. Eachof the four first connection portions CO1 is curved twice and extendedto connect the adjacent first chamfers CM1. Alternatively, the firstconnection portions CO1 are curved once or three times or more andextended or extended in a straight line to connect the adjacent firstchamfers CM1.

The entire edge of the first organic emission layer OL1 includes fourfirst chamfers CM1 and four first connection portions CO1, and as aresult, a distance L1 between one edge of the first opening OM1 disposedon a first virtual straight line VL1 traversing the first opening OM1and one edge of the first organic emission layer OL1 is different from asecond distance L2 between the other edge of the first opening OM1disposed on a second virtual straight line VL2 which is parallel to thefirst straight line VL1 to traverse the first opening OM1 and the otheredge of the first organic emission layer Oil. In other words, the samefirst connection portion CO1 has at least two points that have differentdistances from a same edge, which is disposed between the same firstconnection portion CO1 and a central point of the first opening OM1, ofthe first opening OM1. More specifically, the second distance L2 closeto the first chamfer CM1 adjacent to the corner of the first opening OM1is longer than the first distance L1.

The first organic emission layer OL1 includes an organic materialemitting red light, and a portion which is positioned at the firstopening OM1 and contacts the first electrode E1 emits red light. Thatis, the first organic emission layer OL1 has a quadrangular shape whichis the first polygonal shape of the first opening OM1 and emits the redlight.

Alternatively, the first organic emission layer OL1 may include anorganic material emitting blue, green, or white light, and in this case,the portion which is positioned at the first opening OM1 and contactsthe first electrode E1 emits blue, green, or white light.

The second organic emission layer OL2 is positioned on the pixeldefining layer PDL through the second electrode E2 corresponding to thesecond opening OM2. The second organic emission layer OL2 includes asecond chamfer CM2 adjacent to a corner of the second opening OM2 whichis a hexagon.

The entire edge of the second organic emission layer OL2 has ahexadecagonal shape, and includes four second chamfers CM2 and foursecond connection portions CO2 connecting ends of the second chamfersCM2. Each of the four second connection portions CO2 is curved twice andextended to connect the adjacent second chamfers CM2. Alternatively, thesecond connection portions CO2 are curved once or three times or moreand extended or extended in a straight line to connect the adjacentsecond chamfers CM2.

The second chamfer CM2 of the second organic emission layer OL2 isoverlapped with the first chamfer CM1 of the first organic emissionlayer OL1 at a top portion of the pixel defining layer PDL. Even thoughthe second chamfer CM2 of the second organic emission layer OL2 isoverlapped with the first chamfer CM1 of the first organic emissionlayer OL1, since the first electrode E1 or the second electrode E2 isnot positioned at the top portion of the pixel defining layer PDL, thefirst chamfer CM1 of the first organic emission layer OL1 and the secondchamfer CM2 of the second organic emission layer OL2 which are theoverlapped portions do not emit light.

The second organic emission layer OL2 includes an organic materialemitting blue light, and a portion which is positioned at the secondopening OM2 and contacts the second electrode E2 emits blue light. Thatis, the second organic emission layer OL2 has a hexagonal shape which isthe second polygonal shape of the second opening OM2 and emits the bluelight.

Alternatively, the second organic emission layer OL2 may include anorganic material emitting red, green, or white light, and in this case,the portion which is positioned at the second opening OM2 and contactsthe second electrode E2 emits red, green, or white light.

The third organic emission layer OL3 is positioned on the pixel defininglayer PDL through the third electrode E3 corresponding to the thirdopening OM3. The entire edge of the third organic emission layer OL3 hasan octagonal shape having a larger area than the third opening OM3.

The partial edge spaced apart from the first chamfer CM1 and the secondchamfer CM2 among the entire edges of the third organic emission layerOL3 is overlapped with the edges of the first organic emission layer OL1and the second organic emission layer OL2 at a top portion of the pixeldefining layer PDL, respectively. Even though the partial edge of thethird organic emission layer OL3 is overlapped with the edges of thefirst organic emission layer OL1 and the second organic emission layerOL2, respectively, since the first electrode E1, the second electrodeE2, or the third electrode E3 is not positioned at the top portion ofthe pixel defining layer PDL, the partial edges of the first organicemission layer OL1, the second organic emission layer OL2, and the thirdorganic emission layer OL3 which are the overlapped portions do not emitlight.

The third organic emission layer OL3 includes an organic materialemitting green light, and a portion which is positioned at the thirdopening OM3 and contacts the third electrode E3 emits green light. Thatis, the third organic emission layer OL3 has an octagonal shape which isthe third polygonal shape of the third opening OM3 and emits the greenlight.

Alternatively, the third organic emission layer OL3 may include anorganic material emitting red, blue, or white light, and in this case,the portion which is positioned at the third opening OM3 and contactsthe third electrode E3 emits red, blue, or white light.

The common electrodes CE are positioned on the first organic emissionlayer OL1, the second organic emission layer OL2, and the third organicemission layer OL3 all over the surface of the substrate SU, and each ofthe common electrodes CE may be a cathode functioning as an electroninjection electrode or an anode. The common electrode CE may be formedas a light transmitting electrode or a light reflecting electrode.

As such, the organic light emitting diode display according to the firstembodiment is implemented at high resolution in a limited display area,and as a result, distances between the corners of the first opening OM1,the second opening OM2, and the third opening OM3 which are adjacent toeach other are decreased and simultaneously, the first organic emissionlayer OL1 is formed to have a larger area than the first opening OM1.Accordingly, even though the first organic emission layer OL1 ispositioned at the top portion of the pixel defining layer PDL, the firstorganic emission layer OL1 includes the first chamfer CM1 adjacent tothe corner of the first opening OM1, and as a result, when the firstorganic emission layer OL1 is deposited, the first chamfer CM1 which isan outermost edge of the first organic emission layer OL1 is preventedfrom intruding into the second opening OM2 or the third opening OM3.That is, the organic light emitting diode display, which prevents colorsof light emitted from the first opening OM1, the second opening OM2, andthe third opening OM3 from being mixed, is provided.

Further, the organic light emitting diode display according to the firstembodiment is implemented at high resolution in a limited display area,and as a result, distances between the corners of the first opening OM1,the second opening OM2, and the third opening OM3 which are adjacent toeach other are decreased and simultaneously, the second organic emissionlayer OL2 is formed to have a larger area than the second opening OM2.Accordingly, even though the second organic emission layer OL2 ispositioned at the top portion of the pixel defining layer PDL andoverlapped with the first chamfer CM1 of the first organic emissionlayer OL1, the second organic emission layer OL2 includes the secondchamfer CM2 adjacent to the corner of the second opening OM2, and as aresult, when the second organic emission layer OL2 is deposited, thesecond chamfer CM2 which is an outermost edge of the second organicemission layer OL2 is prevented from intruding into the first openingOM1 or the third opening OM3. That is, the organic light emitting diodedisplay, which prevents colors of light emitted from the first openingOM1, the second opening OM2, and the third opening OM3 from being mixed,is provided.

Hereinafter, a mask unit according to a second embodiment used when thefirst organic emission layer, the second organic emission layer, and thethird organic emission layer of the organic light emitting diode displayaccording to the first embodiment described above are manufactured willbe described with reference to FIGS. 3 through 8.

The mask unit includes a first mask, a second mask, and a third maskused when the first organic emission layer, the second organic emissionlayer, and the third organic emission layer are manufactured.

FIG. 3 is a diagram illustrating a partial plane of a first mask of amask unit according to a second embodiment. FIG. 4 is a diagram fordescribing formation of a first organic emission layer using the firstmask illustrated in FIG. 3.

As illustrated in FIGS. 3 and 4, a first mask MASK1 of the mask unitaccording to the second embodiment is used when depositing the firstorganic emission layer OL1 and includes a first mask pattern portionMP1. The first mask MASK1 is disposed on the pixel defining layer PDLduring a depositing process for forming the first organic emission layerOil.

The first mask pattern portion MP1 is positioned on the first electrodeE1, disposed on the pixel defining layer PDL including the first openingOM1 having a first polygonal shape opening the first electrode E1, andused when the first organic emission layer OL1 is formed. The first maskpattern portion MP1 has a dotted shape, and is through-formed tocorrespond to the pixel defining layer PDL through the first electrodeE1 corresponding to the first opening OM1. The first mask patternportion MP1 includes a first mask chamfer MC1 corresponding to thecorner of the first opening OM1.

The entire edge of the first mask pattern portion MP1 has ahexadecagonal shape corresponding to the entire shape of the firstorganic emission layer OL1, and includes four first mask chamfers MC1which are spaced apart from each other and four first mask connectionportions MO1 connecting ends of the first mask chamfers MC1. Each of thefour first mask connection portions MO1 is curved twice and extended toconnect the adjacent first mask chamfers MC1. Alternatively, the firstmask connection portions MO1 are curved once or three times or more andextended or extended in a straight line to connect the adjacent firstmask chamfers MC1.

The first organic emission layer OL1 is formed on the first electrode E1through the first mask pattern portion MP1.

FIG. 5 is a diagram illustrating a partial plane of a second mask of themask unit according to the second embodiment. FIG. 6 is a diagram fordescribing formation of a second organic emission layer using the secondmask illustrated in FIG. 5.

As illustrated in FIGS. 5 and 6, a second mask MASK2 of the mask unitaccording to the second embodiment is used when depositing the secondorganic emission layer OL2 and includes a second mask pattern portionMP2. The second mask MASK2 is disposed on the pixel defining layer PDLduring a depositing process for forming the second organic emissionlayer OL2.

The second mask pattern portion MP2 is positioned on the secondelectrode E2, disposed on the pixel defining layer PDL including thesecond opening OM2 having a second polygonal shape opening the secondelectrode E2, and used when the second organic emission layer OL2 isformed. The second mask pattern portion MP2 has a dotted shape, and isthrough-formed to correspond to the pixel defining layer PDL through thesecond electrode E2 corresponding to the second opening OM2. The secondmask pattern portion MP2 includes a second mask chamfer MC2corresponding to the corner of the second opening OM2.

The entire edge of the second mask pattern portion MP2 has ahexadecagonal shape corresponding to the entire shape of the secondorganic emission layer OL2, and includes four second mask chamfers MC2which are spaced apart from each other and four second mask connectionportions MO2 connecting ends of the second mask chamfers MC2. Each ofthe four second mask connection portions MO2 is curved twice andextended to connect the adjacent second mask chamfers MC2.Alternatively, the second mask connection portions MO2 are curved onceor three times or more and extended or extended in a straight line toconnect the adjacent second mask chamfers MC2.

The second mask chamfer MC2 of the second mask pattern portion MP2 isoverlapped with the first chamfer CM1 of the first organic emissionlayer OL1 formed on the pixel defining layer PDL through the first maskpattern portion MP1 of the first mask MASK1.

The second organic emission layer OL2 is formed on the second electrodeE2 through the second mask pattern portion MP2.

FIG. 7 is a diagram illustrating a partial plane of a third mask of themask unit according to the second embodiment. FIG. 8 is a diagram fordescribing formation of a third organic emission layer using the thirdmask illustrated in FIG. 7.

As illustrated in FIGS. 7 and 8, a third mask MASK3 of the mask unitaccording to the second embodiment is used when depositing the thirdorganic emission layer OL3 and includes a third mask pattern portionMP3. The third mask MASK3 is disposed on the pixel defining layer PDLduring a depositing process for forming the third organic emission layerOL3.

The third mask pattern portion MP3 is positioned on the third electrodeE3, disposed on the pixel defining layer PDL including the third openingOM3 having a third polygonal shape opening the third electrode E3, andused when the third organic emission layer OL3 is formed. The third maskpattern portion MP3 has a dotted shape, and is through-formed tocorrespond to the pixel defining layer PDL through the third electrodeE3 corresponding to the third opening OM3. The third mask patternportion MP3 is formed in a shape corresponding to the third opening OM3.

The entire edge of the third mask pattern portion MP3 has an octagonalshape to correspond to the entire shape of the third organic emissionlayer OL3.

A partial edge of the entire edge of the third mask pattern portion MP3which is spaced apart from the first chamfer CM1 of the first organicemission layer OL1 formed on the pixel defining layer PDL through thefirst mask pattern portion MP1 and the second chamfer CM2 of the secondorganic emission layer OL2 formed on the pixel defining layer throughthe second mask pattern portion MP2 is overlapped with each edge of thefirst organic emission layer OL1 and the second organic emission layerOL2.

The third organic emission layer OL3 is formed on the third electrode E3through the third mask pattern portion MP3.

As such, in the mask unit according to the second embodiment, eventhough the organic light emitting diode display according to the firstembodiment is implemented at high resolution in a limited display areaand thus even though the sizes of the first opening OM1, the secondopening OM2, and the third opening OM3 become significantly reduced, thefirst mask pattern portion MP1, the second mask pattern portion MP2, andthe third mask pattern portion MP3 of the first mask MASK1, the secondmask MASK2, and the third mask MASK3 are expanded up to the top portionof the pixel defining layer PDL through the first opening OM1, thesecond opening OM2, and the third opening OM3 to be largely formed, andas a result, the first mask pattern portion MP1, the second mask patternportion MP2, and the third mask pattern portion MP3 may be easily formedat the first mask MASK1, the second mask MASK2, and the third maskMASK3, respectively. That is, the mask unit including the first maskMASK1, the second mask MASK2, and the third mask MASK3 of whichmanufacturing yield is improved is provided.

Further, in the mask unit according to the second embodiment, eventhough the organic light emitting diode display according to the firstembodiment is implemented at high resolution in a limited display areaand thus distances between corners of the first opening OM1, the secondopening OM2, and the third opening OM3 which are adjacent to each otherare decreased, the first mask pattern portion MP1 and the second maskpattern portion MP2 include the first mask chamfer MC1 corresponding tothe corner of the first opening OM1 and the second mask chamfer MC2corresponding to the corner of the second opening OM2 and as a result,when the first organic emission layer OL1 and the second organicemission layer OL2 are deposited through the first mask pattern portionMP1 and the second mask pattern portion MP2, the first chamfer CM1 whichis an outermost edge of the first organic emission layer OL1 isprevented from intruding into the second opening OM2 or the thirdopening OM3 and simultaneously, the second chamfer CM2 which is anoutermost edge of the second organic emission layer OL2 is preventedfrom intruding into the first opening OM1 or the third opening OM3. Thatis, the mask unit, which prevents an undesired organic emission layerfrom being deposited in the first opening OM1, the second opening OM2,and the third opening OM3, is provided.

Hereinafter, an organic light emitting diode display according to athird embodiment will be described with reference to FIG. 9. FIG. 9 is adiagram illustrating a partial plane of an organic light emitting diodedisplay according to a third embodiment.

Hereinafter, only features distinguished from those of the firstembodiment are extracted and described, and portions of which thedescription is omitted follow the first embodiment.

The organic light emitting diode display according to the thirdembodiment may be an organic light emitting diode display which ismanufactured by a process error generated when designing the organiclight emitting diode display according to the first embodiment describedabove and manufacturing the designed organic light emitting diodedisplay.

As illustrated in FIG. 9, an organic light emitting diode displayaccording to the third embodiment includes a substrate, a circuit part,a first electrode E1, a second electrode E2, a third electrode E3, apixel defining layer PDL, a first organic emission layer OL1, a secondorganic emission layer OL2, a third organic emission layer OL3, and acommon electrode.

The first electrode E1 is positioned on the circuit part and connectedwith a thin film transistor of the circuit part. A central area of thefirst electrode E1 is positioned at a first vertex P1 of a virtualtriangle VT. Here, the virtual triangle VT is an isosceles triangle inwhich central areas of the first electrode E1, the second electrode E2,and the third electrode E3 which are adjacent to each other areconnected to each other. In detail, a length of a first side V1connecting the first vertex P1 and a third vertex P3 of the virtualtriangle VT is the same as a length of a second side V2 connecting thesecond vertex P2 and the third vertex P3.

The first electrode E1 may have various polygonal shapes, and thecentral area of the first electrode E1 is opened by a first opening OM1of the pixel defining layer PDL.

The second electrode E2 is positioned on the circuit part, and spacedapart from the first electrode E1. The second electrode E2 is connectedwith a thin film transistor of the circuit part. A central area of thesecond electrode E2 is positioned at the second vertex P2 of the virtualtriangle VT. The second electrode E2 may have various polygonal shapes,and the central area of the second electrode E2 is opened by a secondopening OM2 of the pixel defining layer PDL.

The third electrode E3 is spaced apart from the first electrode E1 andthe second electrode E2 and positioned on the circuit part. The thirdelectrode E3 is connected with the thin film transistor (TFT) of thecircuit part PC. A central area of the third electrode E3 is positionedat the third vertex P3 of the virtual triangle VT. The third electrodeE3 may have various polygonal shapes, and the central area of the thirdelectrode E3 is opened by a third opening OM3 of the pixel defininglayer PDL.

The first electrode E1 and the second electrode E2 are disposed on avirtual square with the third electrode E3 as the center, and the firstelectrode E1 and the second electrode E2 surround the third electrode E3with the third electrode E3 as the center. Each of the first electrodeE1, the second electrode E2, and the third electrode E3 may be an anodefunctioning as a hole injection electrode or a cathode. The firstelectrode E1, the second electrode E2, and the third electrode E3 may beformed by light transmitting electrodes or light reflecting electrodes.

The pixel defining layer PDL is positioned on the first electrode E1,the second electrode E2, and the third electrode E3, respectively, andcovers edges of the first electrode E1, the second electrode E2, and thethird electrode E3. The pixel defining layer PDL includes the firstopening OM1, the second opening OM2, and the third opening OM3.

The first opening OM1 opens the first electrode E1 and has a firstpolygonal shape which is a quadrangle. The first opening OM1 is spacedapart from the third opening OM3 and the second opening OM2,respectively, and a central point thereof is positioned at the firstvertex P1 of the virtual triangle VT. The first opening OM1 has a largerarea than the adjacent third opening OM3 and has a smaller area than theadjacent second opening OM2. The first opening OM1 has a quadrangularshape among the polygonal shapes, but is not limited thereto and mayhave polygonal shapes such as a triangle, a pentagon, a hexagon, aheptagon, and an octagon. A plurality of first openings OM1 is included,and the plurality of first openings OM1 has the same quadrangular shape.The plurality of first openings OM1 is spaced apart from each other withthe third opening OM3 therebetween. The first organic emission layer OL1emitting red light is positioned on the first electrode E1 opened by thefirst opening OM1. Alternatively, an organic emission layer emittingvarious colored light such as blue, green, or white may be positioned onthe first electrode E1 opened by the first opening OM1.

The second opening OM2 opens the second electrode E2 and has a secondpolygonal shape which is a hexagon. The second opening OM2 is spacedapart from the first opening OM1 and the third opening OM3,respectively, and a central point thereof is positioned at the secondvertex P2 of the virtual triangle VT. The second opening OM2 has alarger area than the adjacent third opening OM3 and the adjacent firstopening OM1, respectively. The second opening OM2 has a hexagonal shapeamong the polygonal shapes, but is not limited thereto and may havepolygonal shapes such as a triangle, a quadrangle, a pentagon, aheptagon, and an octagon. A plurality of second openings OM2 isincluded, and the plurality of second openings OM2 has the samehexagonal shape. The plurality of second openings OM2 is spaced apartfrom each other with the third opening OM3 therebetween. The secondorganic emission layer OL2 emitting blue light is positioned on thesecond electrode E2 opened by the second opening OM2. Alternatively, anorganic emission layer emitting various colored light such as red,green, or white may be positioned on the second electrode E2 opened bythe second opening OM2.

The third opening OM3 opens the third electrode E3 and has a thirdpolygonal shape which is an octagon. The third opening OM3 is spacedapart from the first opening OM1 and the second opening OM2,respectively, and a central point thereof is positioned at the thirdvertex P3 of the virtual triangle VT. The third opening OM3 has asmaller area than the adjacent second opening OM2 and first opening OM1,respectively. The third opening OM3 has an octagonal shape among thepolygonal shapes, but is not limited thereto and may have polygonalshapes such as a triangle, a quadrangle, a pentagon, a hexagon, and aheptagon. A plurality of third openings OM3 is included, and adjacentthird openings OM3 among the plurality of third openings OM3 haveoctagonal shapes which are symmetrical to each other. Meanwhile, theplurality of third openings OM3 may have the same octagonal shape. Thethird organic emission layer OL3 emitting green light is positioned onthe third electrode E3 opened by the third opening OM3. Alternatively,an organic emission layer emitting various colored light such as blue,red, or white may be positioned on the third electrode E3 opened by thethird opening OM3.

Meanwhile, the center of the third opening OM3 is positioned at thecentral point of the virtual square, and centers of the first openingOM1 and the second opening OM2 surrounding the third opening OM3 alongthe virtual square may be positioned at adjacent vertexes of the virtualsquare, respectively.

The first organic emission layer OL1 is positioned on the pixel defininglayer PDL through the first electrode E1 corresponding to the firstopening OM1. The first organic emission layer OL1 includes a firstconvex portion CON1 adjacent to a corner of the first opening OM1 whichis a quadrangle. The first convex portion CON1 intersects a straightline crossing the central point of the first opening OM1 and a vertex,for example, the corner, of the first opening OM1, wherein the vertex orthe corner of the first opening OM1 is disposed between the first convexportion CON1 and the central point of the first opening OM1.

The entire edge of the first organic emission layer OL1 has a closedloop shape formed by curved lines, and is configured by four firstconvex portions CON1 which are connected to each other. A connectionportion between the adjacent first convex portions CON1 is formed by aconcave portion. The entire edge of the first organic emission layer OL1includes the four first convex portions CON1, and as a result, a firstdistance L1 between one edge of the first opening OM1 disposed on afirst virtual straight line VL1 traversing the first opening OM1 and oneedge of the first organic emission layer OL1 is different from a seconddistance L2 between the other edge of the first opening OM1 disposed ona second virtual straight line VL2 which is parallel to the firststraight line VL1 to traverse the first opening OM1 and the other edgeof the first organic emission layer Oil. That is, the second distance L2close to the first convex portion CON1 adjacent to the corner of thefirst opening OM1 is longer than the first distance L1.

The first organic emission layer OL1 includes an organic materialemitting red light, and a portion which is positioned at the firstopening OM1 and contacts the first electrode E1 emits red light. Thatis, the first organic emission layer OL1 has a quadrangular shape whichis the first polygonal shape of the first opening OM1 and emits the redlight.

Alternatively, the first organic emission layer OL1 may include anorganic material emitting blue, green, or white light, and in this case,the portion which is positioned at the first opening OM1 and contactsthe first electrode E1 emits blue, green, or white light.

The second organic emission layer OL2 is positioned on the pixeldefining layer PDL through the second electrode E2 corresponding to thesecond opening OM2. The second organic emission layer OL2 includes asecond convex portion CON2 adjacent to a corner of the second openingOM2 which is a hexagon.

The entire edge of the second organic emission layer OL2 has a closedloop shape formed by curved lines, and is configured by four secondconvex portions CON2 which are connected to each other. A connectionportion between the adjacent second convex portions CON2 is formed by aconcave portion. The second convex portion CON2 of the second organicemission layer OL2 is overlapped with the first convex portion CON1 ofthe first organic emission layer OL1 at a top portion of the pixeldefining layer PDL. Even though the second convex portion CON2 of thesecond organic emission layer OL2 is overlapped with the first convexportion CON1 of the first organic emission layer OL1, since the firstelectrode E1 or the second electrode E2 is not positioned at the topportion of the pixel defining layer PDL, the first convex portion CON1of the first organic emission layer OL1 and the second convex portionCON2 of the second organic emission layer OL2 which are the overlappedportions do not emit light.

The second organic emission layer OL2 includes an organic materialemitting blue light, and a portion which is positioned at the secondopening OM2 and contacts the second electrode E2 emits blue light. Thatis, the second organic emission layer OL2 has a hexagonal shape which isthe second polygonal shape of the second opening OM2 and emits the bluelight.

Alternatively, the second organic emission layer OL2 may include anorganic material emitting red, green, or white light, and in this case,the portion which is positioned at the second opening OM2 and contactsthe second electrode E2 emits red, green, or white light.

The third organic emission layer OL3 is positioned on the pixel defininglayer PDL through the third electrode E3 corresponding to the thirdopening OM3. The entire edge of the third organic emission layer OL3 hasa closed loop shape surrounding the third opening OM3 and is notoverlapped with each edge of the first organic emission layer OL1 andthe second organic emission layer OL2.

The third organic emission layer OL3 includes an organic materialemitting green light, and a portion which is positioned at the thirdopening OM3 and contacts the third electrode E3 emits green light. Thatis, the third organic emission layer OL3 has an octagonal shape which isthe third polygonal shape of the third opening OM3 and emits the greenlight.

Alternatively, the third organic emission layer OL3 may include anorganic material emitting red, blue, or white light, and in this case,the portion which is positioned at the third opening OM3 and contactsthe third electrode E3 emits red, blue, or white light.

Meanwhile, when the first organic emission layer OL1, the second organicemission layer OL2, and the third organic emission layer OL3 are formed,the opened first mask pattern portion, second mask pattern portion, andthird mask pattern portion of the used first mask, second mask, andthird mask may have the same shape as the first organic emission layerOL1, the second organic emission layer OL2, and the third organicemission layer OL3, respectively.

As such, the organic light emitting diode display according to the thirdembodiment is implemented at high resolution in a limited display area,and as a result, distances between the corners of the first opening OM1,the second opening OM2, and the third opening OM3 which are adjacent toeach other are decreased and simultaneously, the first organic emissionlayer OL1 is formed to have a larger area than the first opening OM1.Accordingly, even though the first organic emission layer OL1 ispositioned at the top portion of the pixel defining layer PDL, the firstorganic emission layer OL1 includes the first convex portion CON1adjacent to the corner of the first opening OM1, and as a result, whenthe first organic emission layer OL1 is deposited, the first convexportion CON1 which is an outermost edge of the first organic emissionlayer OL1 is prevented from intruding into the second opening OM2 or thethird opening OM3. That is, the organic light emitting diode display,which prevents colors of light emitted from the first opening OM1, thesecond opening OM2, the third opening OM3 from being mixed, is provided.

Further, the organic light emitting diode display according to the thirdembodiment is implemented at high resolution in a limited display area,and as a result, distances between the corners of the first opening OM1,the second opening OM2, and the third opening OM3 which are adjacent toeach other are decreased and simultaneously, the second organic emissionlayer OL2 is formed to have a larger area than the second opening OM2.Accordingly, even though the second organic emission layer OL2 ispositioned at the top portion of the pixel defining layer PDL andoverlapped with the first convex portion CON1 of the first organicemission layer OL1, the second organic emission layer OL2 includes thesecond convex portion CON2 adjacent to the corner of the second openingOM2, and as a result, when the second organic emission layer OL2 isdeposited, the second convex portion CON2 which is an outermost edge ofthe second organic emission layer OL2 is prevented from intruding intothe first opening OM1 or the third opening OM3. That is, the organiclight emitting diode display, which prevents colors of light emittedfrom the first opening OM1, the second opening OM2, and the thirdopening OM3 from being mixed, is provided.

As shown in FIGS. 1 and 9 and explained in the first and thirdembodiments of the present invention, the first organic emission layerOL1 covers the entire first opening OM1 and also covers a portion of thepixel defining layer PDL that forms the first opening OM1. Thus, an areaof the first organic emission layer OL1 is greater than an area of thefirst opening OM1.

On the other hand, an outer shape of the first organic emission layerOL1 is geometrically dissimilar to the first polygon formed by the firstopening OM1. For example, the outer shape of the first organic emissionlayer OL1 of the first embodiment shown in FIG. 1 has more edges thanthe first opening OM1 due to the first chamfers CM1 and the curved firstconnection portions CO1. For another example, the outer shape of thefirst organic emission layer OL1 of the third embodiment shown in FIG. 9has the convex portions CON1 and the concave portions connecting theconvex portions CON1. In contrast, the first opening OM1 has fourstraight edges.

Similarly, an area of the second organic emission layer OL2 is greaterthan an area of the second opening OM2, but on the other hand, an outershape of the second organic emission layer OL2 is geometricallydissimilar to the second polygon formed by the second opening OM2.

According to the embodiment, it is possible to provide an organic lightemitting diode display preventing colors of light emitted by one pixelfrom being mixed, even though the organic light emitting diode displayis implemented at high resolution in a limited display area.

Further, according to the embodiment, it is possible to provide a maskunit improving manufacturing yield, even though the mask unit is usedwhen a high resolution organic light emitting diode display ismanufactured in a limited display area.

While this disclosure has been described in connection with what ispresently considered to be practical exemplary embodiments, it is to beunderstood that the invention is not limited to the disclosedembodiments, but, on the contrary, is intended to cover variousmodifications and equivalent arrangements included within the spirit andscope of the appended claims.

What is claimed is:
 1. An organic light emitting diode display,comprising: a first electrode; a second electrode spaced apart from thefirst electrode; a third electrode spaced apart from the firstelectrode; a pixel defining layer positioned on the first electrode, thesecond electrode, and the third electrode, the pixel defining layerincluding a first opening, a second opening, and a third openingrespectively corresponding to the first electrode, the second electrode,and the third electrode; a first organic emission layer, a secondorganic emission layer, and a third organic emission layer respectivelyoverlapping the first electrode, the second electrode, and the thirdelectrode, wherein: the first organic emission layer is positioned onthe pixel defining layer across the first electrode corresponding to thefirst opening and includes a first convex portion being pointed to by anadjacent corner of the first opening; the first electrode and the secondelectrode are alternately disposed in a first direction; the firstelectrode and the second electrode are alternately disposed in a seconddirection perpendicular to the first direction; the first electrode andthe third electrode are alternately disposed in a third directiondifferent from the first direction and the second direction; and avirtual line connecting a central point of the first electrode and acentral point of the third electrode is parallel to the third directionand oblique to the first direction and the second direction.
 2. Theorganic light emitting diode display of claim 1, wherein an entire edgeof the first organic emission layer includes four first convex portionswhich are connected to each other.
 3. The organic light emitting diodedisplay of claim 1, wherein: a central point of the first opening ispositioned at a first vertex of a virtual triangle; a central area ofthe second electrode is positioned at a second vertex of the virtualtriangle; the second opening has a second polygonal shape exposing thesecond electrode and of which a central point is positioned at thesecond vertex; and the second organic emission layer includes a secondconvex portion adjacent to a corner of the second opening.
 4. Theorganic light emitting diode display of claim 3, wherein an entire edgeof the second organic emission layer includes four second convexportions which are connected to each other.
 5. The organic lightemitting diode display of claim 3, wherein the first convex portion ofthe first organic emission layer is overlapped with the second convexportion of the second organic emission layer.
 6. The organic lightemitting diode display of claim 3, wherein: a central area of the thirdelectrode is positioned at a third vertex of the virtual triangle; andthe third opening has a third polygonal shape exposing the thirdelectrode and of which a central point is positioned at the thirdvertex.
 7. The organic light emitting diode display of claim 6, whereinan entire edge of the third organic emission layer has a closed loopshape surrounding the edge of the third opening.
 8. The organic lightemitting diode display of claim 6, wherein the virtual triangle is anisosceles triangle in which a length of a first side connecting thefirst vertex and the third vertex is the same as a length of a secondside connecting the second vertex and the third vertex.
 9. The organiclight emitting diode display of claim 6, wherein the first opening has aquadrangular shape, the second opening has a hexagonal shape, and thethird opening has an octagonal shape.
 10. The organic light emittingdiode display of claim 6, wherein the entire edge of the third organicemission layer is not overlapped with each edge of the first organicemission layer and the second organic emission layer.
 11. The organiclight emitting diode display of claim 6, wherein the first opening has alarger area than the third opening and has a smaller area than thesecond opening.
 12. The organic light emitting diode display of claim 6,wherein: one of the first organic emission layer and the second organicemission layer emits a red light and the other thereof emits a bluelight, and the third organic emission layer emits a green light; and anarea of the third opening is smaller than an area of the first openingand an area of the second opening in a plan view.
 13. The organic lightemitting diode display of claim 1, wherein a first distance between astraight edge of the first opening and an edge of the first organicemission layer intersecting a first virtual straight line traversing thefirst opening is different from a second distance between a straightedge of the first opening and an edge of the first organic emissionlayer intersecting a second virtual straight line traversing the firstopening in a plan view, and the second virtual straight line is parallelto the first virtual straight line in a plan view.
 14. The organic lightemitting diode display of claim 1, wherein the first organic emissionlayer comprises at least two first convex portions, and the firstorganic emission layer further includes a concave portion positionedbetween adjacent first convex portions in a plan view.
 15. The organiclight emitting diode display of claim 1, wherein a third direction is adiagonal direction between the first direction and the second direction.16. The organic light emitting diode display of claim 1, wherein thesecond electrode and third electrode are alternately disposed in thethird direction, which is a diagonal direction between the firstdirection and the second direction.
 17. The organic light emitting diodedisplay of claim 1, wherein the first electrode and the third electrodeare not alternately disposed in the first direction and the seconddirection.
 18. An organic light emitting diode display, comprising: afirst electrode; a second electrode spaced apart from the firstelectrode; a third electrode spaced apart from the first electrode; apixel defining layer positioned on the first electrode, the secondelectrode, and the third electrode, the pixel defining layer including afirst opening, a second opening, and a third opening respectivelycorresponding to the first electrode, the second electrode, and thethird electrode; a first organic emission layer, a second organicemission layer, and a third organic emission layer respectivelyoverlapping the first electrode, the second electrode, and the thirdelectrode, wherein: the first organic emission layer is positioned onthe pixel defining layer across the first electrode corresponding to thefirst opening and includes first convex portions and a first concaveportion between the first convex portions; the first electrode and thesecond electrode are alternately disposed in a first direction; thefirst electrode and the second electrode are alternately disposed in asecond direction perpendicular to the first direction; the firstelectrode and the third electrode are alternately disposed in a thirddirection different from the first direction and the second direction;and a virtual line connecting a central point of the first electrode anda central point of the third electrode is parallel to the thirddirection and oblique to the first direction and the second direction.19. The organic light emitting diode display of claim 18, wherein: thesecond organic emission layer is positioned on the pixel defining layeracross the second electrode corresponding to the second opening andincludes second convex portions and a second concave portion between thesecond convex portions, and at least one of the first convex portionsoverlaps at least one of the second convex portion.
 20. The organiclight emitting diode display of claim 18, wherein the first organicemission layer includes four first convex portions.
 21. The organiclight emitting diode display of claim 20, wherein: two of the four firstconvex portions are disposed in the first direction, and the other twoof the four first convex portions are disposed in the second direction.